arch/arm/cpu/tegra20-common/pmu.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <tps6586x.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/tegra.h>
  12 #include <asm/arch-tegra/ap.h>
  13 #include <asm/arch-tegra/tegra_i2c.h>
  14 #include <asm/arch-tegra/sys_proto.h>
  15
  16 #define VDD_CORE_NOMINAL_T25    0x17    /* 1.3v */
  17 #define VDD_CPU_NOMINAL_T25     0x10    /* 1.125v */
  18
  19 #define VDD_CORE_NOMINAL_T20    0x16    /* 1.275v */
  20 #define VDD_CPU_NOMINAL_T20     0x0f    /* 1.1v */
  21
  22 #define VDD_RELATION            0x02    /*  50mv */
  23 #define VDD_TRANSITION_STEP     0x06    /* 150mv */
  24 #define VDD_TRANSITION_RATE     0x06    /* 3.52mv/us */
  25
  26 int pmu_set_nominal(void)
  27 {
  28         int core, cpu, bus;
  29
  30         /* by default, the table has been filled with T25 settings */
  31         switch (tegra_get_chip_sku()) {
  32         case TEGRA_SOC_T20:
  33                 core = VDD_CORE_NOMINAL_T20;
  34                 cpu = VDD_CPU_NOMINAL_T20;
  35                 break;
  36         case TEGRA_SOC_T25:
  37                 core = VDD_CORE_NOMINAL_T25;
  38                 cpu = VDD_CPU_NOMINAL_T25;
  39                 break;
  40         default:
  41                 debug("%s: Unknown SKU id\n", __func__);
  42                 return -1;
  43         }
  44
  45         bus = tegra_i2c_get_dvc_bus_num();
  46         if (bus == -1) {
  47                 debug("%s: Cannot find DVC I2C bus\n", __func__);
  48                 return -1;
  49         }
  50         tps6586x_init(bus);
  51         tps6586x_set_pwm_mode(TPS6586X_PWM_SM1);
  52         return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP,
  53                                 VDD_TRANSITION_RATE, VDD_RELATION);
  54 }